TY  - JOUR
AU  - Martin, Catalin
AU  - Martinez, V. A.
AU  - Opačić, Marko R.
AU  - Đurđić-Mijin, Sanja
AU  - Mitrić, Petar
AU  - Umićević, Ana
AU  - Poudel, A.
AU  - Sydoryk, Ihor
AU  - Ren, Weijun
AU  - Martin, Ruaridh M.
AU  - Tanner, David B.
AU  - Lazarević, Nenad
AU  - Petrović, Čedomir
AU  - Tanasković, Darko
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10987
AB  - Intermetallic narrow-gap semiconductors have been intensively explored due to their large thermoelectric power at low temperatures and a possible role of strong electronic correlations in their unusual thermodynamic and transport properties. Here we study the optical spectra and vibrational properties of FeGa3 single crystal. The optical conductivity indicates that FeGa3 has a direct band gap of ≈0.7 eV, consistent with density functional theory (DFT) calculations. Most importantly, we find a substantial spectral weight also below 0.4 eV, which is the energy of the indirect (charge) gap found in resistivity measurements and ab initio calculations. We find that the spectral weight below the gap decreases with increasing temperature, which indicates that it originates from the impurity states and not from the electronic correlations. Interestingly, we did not find any signatures of the impurity states in vibrational spectra. The infrared and Raman vibrational lines are narrow and weakly temperature dependent. The vibrational frequencies are in excellent agreement with our DFT calculations, implying a modest role of electronic correlations. Narrow Mössbauer spectral lines also indicate high crystallinity of the sample. © 2023 American Physical Society.
T2  - Physical Review B
T1  - Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3
VL  - 107
IS  - 16
DO  - 10.1103/PhysRevB.107.165151
ER  - 

@article{
author = "Martin, Catalin and Martinez, V. A. and Opačić, Marko R. and Đurđić-Mijin, Sanja and Mitrić, Petar and Umićević, Ana and Poudel, A. and Sydoryk, Ihor and Ren, Weijun and Martin, Ruaridh M. and Tanner, David B. and Lazarević, Nenad and Petrović, Čedomir and Tanasković, Darko",
year = "2023",
abstract = "Intermetallic narrow-gap semiconductors have been intensively explored due to their large thermoelectric power at low temperatures and a possible role of strong electronic correlations in their unusual thermodynamic and transport properties. Here we study the optical spectra and vibrational properties of FeGa3 single crystal. The optical conductivity indicates that FeGa3 has a direct band gap of ≈0.7 eV, consistent with density functional theory (DFT) calculations. Most importantly, we find a substantial spectral weight also below 0.4 eV, which is the energy of the indirect (charge) gap found in resistivity measurements and ab initio calculations. We find that the spectral weight below the gap decreases with increasing temperature, which indicates that it originates from the impurity states and not from the electronic correlations. Interestingly, we did not find any signatures of the impurity states in vibrational spectra. The infrared and Raman vibrational lines are narrow and weakly temperature dependent. The vibrational frequencies are in excellent agreement with our DFT calculations, implying a modest role of electronic correlations. Narrow Mössbauer spectral lines also indicate high crystallinity of the sample. © 2023 American Physical Society.",
journal = "Physical Review B",
title = "Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3",
volume = "107",
number = "16",
doi = "10.1103/PhysRevB.107.165151"
}

Martin, C., Martinez, V. A., Opačić, M. R., Đurđić-Mijin, S., Mitrić, P., Umićević, A., Poudel, A., Sydoryk, I., Ren, W., Martin, R. M., Tanner, D. B., Lazarević, N., Petrović, Č.,& Tanasković, D.. (2023). Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3. in Physical Review B, 107(16).
https://doi.org/10.1103/PhysRevB.107.165151

Martin C, Martinez VA, Opačić MR, Đurđić-Mijin S, Mitrić P, Umićević A, Poudel A, Sydoryk I, Ren W, Martin RM, Tanner DB, Lazarević N, Petrović Č, Tanasković D. Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3. in Physical Review B. 2023;107(16).
doi:10.1103/PhysRevB.107.165151 .

Martin, Catalin, Martinez, V. A., Opačić, Marko R., Đurđić-Mijin, Sanja, Mitrić, Petar, Umićević, Ana, Poudel, A., Sydoryk, Ihor, Ren, Weijun, Martin, Ruaridh M., Tanner, David B., Lazarević, Nenad, Petrović, Čedomir, Tanasković, Darko, "Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3" in Physical Review B, 107, no. 16 (2023),
https://doi.org/10.1103/PhysRevB.107.165151 . .